Valve seat



Patented May 25, 1937 t v.UNi'riam STATES PATENT OFFICE Leland S. Hamer, Long Beach, Calif.

`Application'March 10, 1934, Serial No. 715,029

2 Claims.

^ 'Ihis invention relates to valve seats for use in pumps and the like and it is a general object of the invention to provide a simple practical valve seat that may be easily and quickly removed from its opening in the Wall of a Valve chest.

The valve seats of pumps, and like mechanisms, are often provided with tapered peripheries or exteriors to lit correspondingly shaped openings in the walls of the valve chests. These valve seats usually accurately t the openings and the valves when closing hammer or drive the seats into the openings so that great difiiculty is often encountered in removing the seats for grinding or re placement. In many instances the valve seats become so tightly set in the openings that they must be broken or destroyed in order to remove them.

Another object of this invention is to provide a valve seat that -may be readily removed from lits opening in the wall of a valve chest by the method and apparatus fully described and claimed in my co-pending application entitled Method and apparatus for disconnecting parts, filed March 10, 1934, Serial No. 715,030.

Another object of the invention is to provide a valve seat that is normally tightly and dependably held in its opening in the wall of the valve chest and may be easily removed from the opening without striking it, jarring it, or otherwise subjecting it to breaking forces.

Anothervobject of the invention is to provide a valve seat that is provided with means whereby it may be loosened or removed from the opening in the wall of a valve chest by fluid pressure acting between the seat and the wall of the opening.

Another object of the invention is to provide a practical, effective valve seat having means for conducting iluid pressure from a fluid pressure source or developing apparatus to a space between its periphery and the wall of the opening in which it is arranged, for the purpose of freeing or removing it from the opening.

A further object of the inventionis to provide a valve seat of the character mentioned that is simple and inexpensive of manufacture.

Other objects and features of my invention will be better and more fully understood from the following detailed description of typical forms and applications of the invention, throughout which description reference may be had to the accompanying drawing, in which: l

Fig. 1 is a longitudinal detailed sectional view of one form of valve seat of the present invention in position in an opening in a wall of a valve chest showing a fluid pressure developing appav ratus in operative connection with the valve seat, and Fig. 2 is a fragmentary longitudinal detailed sectional view of another form of valve seat illustrating the fluid pressure developing means in connection therewith.

The present invention may be embodied in valve seats 'for use in various classes of mechanisms and in valve seats having various specific forms of sealing faces, etc. lowing detailed disclosure I Will describe the invention embodied in valve seats of the general type employed in slush pumps for handling mudladen fluid at comparatively high pressures. It is to be understood that the invention is not to be construed as limited or restricted to the specific forms or applications about to be described but is to be taken as including any features or modifications that may fall within the scope of the claims.

.The valve seat of the invention illustrated in Fig. 1 of the drawing includes, generally, a body I0 for arrangement in an opening II in the wall W` of a valve chest and means I2 in the body I0 for receiving iiuid pressure for removing the body from the opening II.

The body I0 of the valve seat is annular in its general configuration, having a central opening I3 for passing the fluid handled in the pump. In accordance with the usual practice the opening II has inwardly tapered walls, and the exterior or periphery I4 of the valve seat body I0 is tapered and is finished to accurately and tightly fit the opening II. The body I0 projects outwardly from the wall W and its projecting outer end is provided with a suitable sealing face I5 for engagement by the valve. The present invention may be embodied in valve seats having sealing faces of various characters and in valve seats for use in combination with various types of valves. In the particular case illustrated Vin th'e drawing the sealing face I5 of the valve seat body I0 is inclined or tapered inwardly and occupies the entire outer end of the body and the end of an inwardly projecting lip I 6 on the body. In the form of the invention being described the body I0 has a webV I'I projecting into or through its opening I3'. The web I1 is integral with the body I0 and has an'opening I8. The opening I8 is cencentric with the annular body I0 and is provided to slidably receive a guide stem of the valve.

The means I2 is provided to supply .or conduct fluid pressure to a confined space between the body I0 of the seat and the wall of the opening I I for effecting the removal of the valve seat from the opening. In accordance with the inven- 'I'hroughout the foltion the confined space between the seat body l and the wall of the opening II may be in the form of a groove I9 in the periphery of the body I0. The groove I9 is spaced between the ends of the body I0 and is preferably annular to extend completely around the body. The confined iiuid pressure receiving space or groove IS may be of any suitable or desired shape. In the particular case illustrated the groove I3 is substantially triangular in cross sectional configuration, having an inclined inner wall and a substantially normal end wall.

The fluid pressure receiving or handling means I2 includes a port or opening 20 in the valve seat body I 0 for conducting iiuid pressure to the groove I9. The opening communicates with the groove and extends inwardly through the wall of the body Ill into the web I1. In accordance with the invention means is provided for connecting a fluid pressure supply or developing means with the body I0 to deliver fluid pressure to the opening 20. This means may comprise a socket 2| in the outer side of the web I1. The inner end of the socket 2| communicates with the opening 20 and the socket is screw-threaded. An inclined annular shoulder 22 is provided in the outer end or mouth of the socket 2|. If desired or found necessary the web II may be thickened or reinforced adjacent the socket 2| as illustrated at 23. Under normal operating conditions of the pump the opening 2U may be filled with grease or the like and closed by a plug threaded into the socket 2|. When it is desired to remove the valve seat body l0 from the opening II fluid pressure is supplied to the confined space or groove I9 through the socket and opening 20 which pressure acts to release and disconnect the seat from the wall of the opening I I.

In Fig. l of the drawing I have illustrated a form of fluid pressure developing or supplying means fully described and claimed in my co-pending application referred to above. This device or apparatus includes a tubular body member and a cylinder 3| screw-threaded into an end of the member 3|). A reduced opening 32 is provided in the end portion of the cylinder 3| to conduct iiuid from the principal opening 33 of the cylinder. A screw 34 is threaded into the body member 30 and carries a plunger 35 for operation in the cylinder opening 33. The projecting end of the screw 34 is provided with a polygonal head 36. 'I'he active end of the plunger 35 has a cup leather or plunger cup 3l for slidably sealing with the wall of the cylinder opening 33. A removably keyed nut 38 retains the plunger cup 3'I in position. The outer end of the cylinder opening 33 and the passage 32 may be supplied or filled with grease or other suitable fluid. A threaded pin or reduced portion 4U is provided on the end of the cylinder 3|. The upper end of the threaded pin is provided with a bevelled shoulder 4I for cooperating with the shoulder 22 and makes an effective seal between the cylinder 3| and the valve seat body I0.

When the valve seat I 0 is to be removed from the opening II the plug mentioned above is first removed from the socket 2| and the reduced portion or pin 40 of the cylinder 3| is threaded into the socket. The screw 34 may then be threaded inwardly to operate the plunger 35 into the cylinder opening 33. 'I'his puts the grease or fluid in the opening 20 and groove I9 under pressure. When sufficient pressure has been created in the groove I8 it suddenly frees or releases the seat body l0 from the wall of the opening II.

Fluid pressure in the confined space or annular groove I9 acts outwardly against the wall of the opening II and inwardly against the body I0 and when the pressure becomes suiiiciently great it suddenly springs the periphery of the seat body I0 free of the wall of the opening II, thus releasing or disengaglng the seat body I0 from the opening II. The valve seat illustrated in Fig. 1 of the drawing does not involve any parts that materially interfere with the flow of fluid through the seat and is not weakened to any appreciable extent by the provision of the opening 20 and the groove I9. The valve seat may be quickly removed from the opening II in the manner described above without striking it.

The form of the present invention illustrated in Fig. 2 of the drawing includes an annular body Il)a of substantially the same configuration as the body IIJ described above. The exterior or periphery I4 of the body I Ila is longitudinally tapered to tightly and evenly cooperate with the wall of the opening II in the valve chest wall. The body I0 may or may not have a valve guiding web. A concaved or inwardly dished sealing face I5a is provided on the projecting outer end of the body IU,

The means I2EL for supplying or conducting fiuid pressure for the purpose of removing the seat body l0a from the opening II includes a groove I9*1 in the periphery of the body. The groove |99' is spaced between the ends of the body and is preferably annular to surround the body. The particular groove I9a shown in the drawing is of the same configuration as the groove I9. A socket 2I9- is provided in the wall of the body opening I3 and extends radially outwardly to communicate with the groove |92. The socket 2|a is threaded for the reception of a threaded part or fitting. While I have shown the socket 2N having a longitudinal axis substantially normal to the longitudinal axis of the seat body Illa it will be apparent that the socket may have its longitudinal axis pitched or inclined inwardly and toward the groove |95. The confined space or groove liga may be filled or supplied with grease and normally closed by a plug threaded into the socket 2| a. This prevents the accumulation of solid material in the groove' IS. The socket 2l may receive a threaded part on a fluid pressure developing or supplying apparatus or may receive a suitable adapter or fitting for facilitating the connection of such an apparatus with the body of the seat. In the particular arrangement illustrated in the drawing a fitting 5I) in the form of an elbow has one end threaded into the socket ZIB. The mouth or socket 5I of the elbow 5U faces outwardly to receive the reduced portion or pin 40 on the cylinder 3|. It is to be understood that the fitting 5U may receive the threaded parts of other fluid pressure supplying or developing means.

To remove the valve seat body I l)a from the opening II the pin 40 of the cylinder 3| is threaded into the elbow and the screw 34 is threaded inwardly as described above. This puts the fluid in the groove I3El under pressure and when the pressure in the groove I9 reaches a certain value the valve seat body is suddenly released from the wall of the opening II. The fluid under high pressure in the groove I9a is effective in disconnecting or releasing the valve seat from the wall of the opening II without in any way harming or endangering the valve seat. The fitting 50 may be quickly threaded into the CFI socket 2| after the removal of the plug from the 75 Gil pressure supplying -apparatus with the body Illa.

The provision of the socket 2l and the groove I!!a does not necessitate enlarged or projecting parts on the valve seat .body and does not complicate the construction or make it expensive. The plug in the opening 2|, if used, may be substantially flush with the wall of the body opening i3a so that it does not form an obstruction in the opening. The valve' seats of the present invention are simple in construction and adapted to be easily and quickly removed from their openings in .the valve chests of pumps and the like.'

Having described only typical preferred forms andapplications of my invention, I do not wish to be limited or restricted to the specific forms and applications herein set forth, but wish to reserve to myself any modifications or variations that may appear to those skilled in the art or fall within the scope of the following claims.

Having described my invention, I claim: 1. A valve seatfor arrangement in a tapered opening in a wall, including an annular body lhaving a tapered Vouter periphery adapted to bear in the opening whereby it is xed therein, and an inwardly extending valve guiding web on the body, and means for releasing the body 111cm the opening comprising walls on ther body providing a groove in its o uter periphery adapted to form a oonnedspacebetween thebody and the;

wall of the opening, and a port communicating with the groove and extending into the web and to the exterior thereof.

2. A valve seat for arrangement in a tapered opening in a wall, including an annular body bear in the opening wherebyit is xed therein, and an inwardly extending valve lguiding web on the body, the body having a groove in its outer periphery adapted to form a. confined space between the body and the wall of the opening, a. threaded socket in the web, and a port extending between the socket and groove for conducting fluid pressure to the space to release the body from the wall.

LELAND S. HAMER.

- having a tapered outer periphery adaptedto 

